Jake's Roof Repair provided the following data concerning its costs:

For example, wages and salaries should be $$21,100$ plus $$15\mathrm{.}00$ per repair$-$hour. The company expected to work $2,500$ repair$-$hours in

May but actually worked $2,400$ repair$-$hours. The company expects its sales to be $$50\mathrm{.}00$ per repair$-$hour.

Required:

Compute the company's activity variances for May.

Note: Indicate the effect of each variance by selecting $"$F$"$ for favorable, $"$U$"$ for unfavorable, and "None" for no effect $($i$.$e$.,$ zero

variance$).$ Input all amounts as positive values.